Ultrasonic tips as an auxiliary method for the instrumentation of oval-shaped root canals

Abstract

To evaluate the influence of novel ultrasonic tips as an auxiliary method for the rotary preparation of flattened/oval-shaped canals. Fortyfive mandibular incisors were selected and divided into one of three experimental groups (n = 15): Group PFCP-ProDesign Logic 25/.05 + Flatsonic + Clearsonic + Prodesign Logic 40/.01; Group FCP-Flatsonic + Clearsonic + ProDesign Logic 40/.01; and Group PP-Prodesign Logic 25/.05 + Prodesign Logic 40/.05. The teeth were scanned preoperatively and postoperatively using microcomputed tomography. The percentage values for increase in volume, non-instrumented surface area, dentin removal, degree of canal transportation, and centering ratio between the experimental groups were examined. Data were analyzed using the non-parametric Kruskal-Wallis and Dunn's tests (p < 0.05). Group PFCP showed the greatest volume increase in the total portion of the root canal and the lowest percentage of non-instrumented surface area. Regarding the degree of transportation in the buccolingual direction, statistically significant differences between groups PFCP and PP were observed at the coronal third of the canal. In the mesiodistal direction, no statistically significant differences were observed at the coronal, middle, and apical thirds. As for the centering ratio, statistically significant differences were found in the buccolingual direction. In the mesiodistal direction, no statistically significant differences were observed at the coronal, middle, and apical thirds. The use of novel ultrasonic tips combined with rotary instruments in group PFCP provided a significant increase in volume and reduced the percentage of non-instrumented areas during the preparation of flattened/oval-shaped canals.

Effect of obturation technique using a new bioceramic sealer on the presence of voids in flattened root canals

“…27 Previous studies have reported that the mechanical effect of ultrasonic tips in oval and long oval canal preparation may optimize their cleaning, by decreasing the uninstrumented surface. 8,28 To this end, the present study used a Flatsonic ultrasonic tip to improve cleaning of the flattened root canals, by allowing better adaptation of the filling material. In addition, the current study used micro-CT analysis, owing to its optimal results in several studies that quantified the voids in root canal fillings.…”

“…1,3,4,5,6 Root canals with a large buccolingual extension are more difficult to fill. 1,3,4,5,6 Moreover, the centric position obtained by nickel-titanium (NiTi) instruments leaves a considerable uninstrumented surface in flattened areas, 7,8,9 thereby affecting the quality of root canal fillings. 1,3,5 Although some studies have evaluated the obturation of oval canals, 1,3,4,5,6 the literature is very scarce regarding the filling of flattened canals with a buccolingual diameter 4 or more times larger than the mesiodistal diameter.…”

Micro‐CT evaluation of filling of flattened root canals using a new premixed ready‐to‐use calcium silicate sealer by single‐cone technique

“…No technique or filling material is capable of completely filling root canals (Celikten et al, 2015; Celikten et al, 2016), especially in root canals with large buccal‐lingual extension (Celikten et al, 2016; Metzger et al, 2010). Centralized preparation using nickel‐titanium instruments in flattened root canals (Rivera‐Peña et al, 2019) promotes high percentage of uninstrumented surfaces and debris, harming root canal filling (Metzger et al, 2010).…”

Preparación Ultrasónica del Espacio Protésico y su Influencia en la Resistencia Adhesiva de Postes de Fibroresina en Conductos Ovalados

“…Odontostomat., 14(1):109-116, 2020 actuando solamente en las paredes del conducto donde se posicionará el poste (Coniglio et al, 2008). El uso de estas fresas en conductos ovales, deja paredes intactas con materiales de obturación endodóntico y debris residual (Keles et al, 2014;Rivera-Peña et al, 2019), lo que se traduce en una menor superficie disponible para la cementación adhesiva de postes de fibroresina aumentando el riesgo de desalojo (Maroulakos et al, 2018). Esto explica los menores valores de resistencia obtenidos en el grupo desobturado rotatoriamente al compararlo con el grupo desobturado ultrasónicamente.…”